#!/bin/bash
#######################################################################
# Update the HE (Hurricane Electric) ipv6-tunnel
#######################################################################
# Interfaces to try, in order: en1 = Airport, en0 = Ethernet
MYIFS="en0 en1"

# leave as is
IPCACHE="/Library/Caches/ipv6scriptIP"

# Your Tunnel settings start here
# 1. get HEUSER hash from the website, "UserID"
# 2. get HEPASS hash: echo -n YourPass|md5
# 3. get HETUNNEL from the website, "Global Tunnel ID"
# 4. get other settings from the website

HEUSER=fb3f06c821388858cafe95cea24895d3
HEPASS=420cc447758fe38e9df69a3a17c77c33
HETUNNEL=123456

HETUNEND=216.66.00.00
HEYOUR6END=2001:0123:123a:1234::2
HETHEIR6END=2001:0123:123a:1234::1
HEPREFIX=64

# This is some IP from the "Routed /64" pool, used for outgoing connections from your Mac.
# Should it get blocked by anyone, you can simply change it to any other IP from the pool
# without having to apply for a new tunnel. e.g. if your Routed /64 pool is 
# 2001:0123:123b:1234::/64, you can use this for your IP:

HEMY64IP=2001:0123:123b:1234::0bad:cafe

#######################################################################
# Config end
#######################################################################
# sometimes this script will get executed twice at the same time, not good, so:
if [ -f $IPCACHE.lock ] ; then
  echo A copy already running!
  exit 0
else
 touch $IPCACHE.lock
fi
# This is faster if your router sets a dyndns entry:
#NEW_IP=`dig mycomp.myvnc.com|grep "^mycomp"| grep -Eo "\<[[:digit:]]{1,3}(\.[[:digit:]]{1,3}){3}\>"`
NEW_IP=`curl -s "http://www.networksecuritytoolkit.org/nst/cgi-bin/ip.cgi"`

# Wait for the network...
while [ ! -n "$NEW_IP" ]
do
	sleep 10
  #NEW_IP=`dig mycomp.myvnc.com|grep "^mycomp"| grep -Eo "\<[[:digit:]]{1,3}(\.[[:digit:]]{1,3}){3}\>"`
  NEW_IP=`curl -s "http://www.networksecuritytoolkit.org/nst/cgi-bin/ip.cgi"`
done


OLD_IP=`cat $IPCACHE`
if [ "$NEW_IP" = "$OLD_IP" ] ; then
	CURCONF=`ifconfig |grep $HETUNEND`
   if [ -n "$CURCONF" ] ; then
		echo Nothing to do
		rm $IPCACHE.lock
		exit 0
	fi
fi

echo -n $NEW_IP > $IPCACHE

# if you need to use your public ip address, use LOCAL_IP=$NEW_IP instead
for myif in $MYIFS; do
	LOCAL_IP=`ifconfig $myif |grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'`
	if [ -n "$LOCAL_IP" ]; then break; fi
done


# let's delete a pre-existing gif0, ignore any errors
ifconfig gif0 deletetunnel
ifconfig gif0 down
ifconfig gif0 inet6 $HEYOUR6END delete
ifconfig gif0 inet6 $HEMY64IP delete
route delete -inet6 default -interface gif0

# update the tunnel
curl -k -s "https://ipv4.tunnelbroker.net/ipv4_end.php?ipv4b=$NEW_IP&pass=$HEPASS&user_id=$HEUSER&tunnel_id=$HETUNNEL"
echo " "

sleep 1
ifconfig gif0 tunnel $LOCAL_IP $HETUNEND
ifconfig gif0 inet6 $HEMY64IP/64 alias
ifconfig gif0 inet6 $HEYOUR6END $HETHEIR6END prefixlen /$HEPREFIX
route -n add -inet6 default $HETHEIR6END

rm $IPCACHE.lock
exit 0
